SWORDTAIL
swordtail, helleri, topminnow, Xyphophorus helleri
(noun) freshwater fish of Central America having a long swordlike tail; popular aquarium fish
Source: WordNet® 3.1
Etymology
Noun
swordtail (plural swordtails)
One of many species of freshwater fish, in genus Xiphophorus, others of which are called platyfish.
Any of various papilionid butterflies that have a long sword-like projection from the tornal section of each hindwing.
Hyponyms
• green swordtail
Source: Wiktionary
Sword"tail`, n. (Zoöl.)
(a) The limulus.
(b) Any hemipterous insect of the genus Uroxiphus, found upon forest
trees.
Source: Webster’s Unabridged Dictionary 1913 Edition